If my daughter's taxable income of $4533 has a tax rate of .10, why is the tax owed coming up $1141 instead of $453 ?

Return is for my daughter

Total Income            $16,880

Federal Deductions  $12,347

Taxable Income          $4533

Credits                              $6

Tax Owed                  $1,141

Why is tax owed so much higher than applicable tax rate of .10 ?